staging: gdm72xx: check return value of sscanf

Signed-off-by: Ben Chan <benchan@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm72xx/gdm_wimax.c

@@ -291,8 +291,9 @@ static void __gdm_wimax_event_send(struct work_struct *work)
 		e = list_entry(wm_event.evtq.next, struct evt_entry, list);
 		spin_unlock_irqrestore(&wm_event.evt_lock, flags);
 
-		sscanf(e->dev->name, "wm%d", &idx);
-		netlink_send(wm_event.sock, idx, 0, e->evt_data, e->size);
+		if (sscanf(e->dev->name, "wm%d", &idx) == 1)
+			netlink_send(wm_event.sock, idx, 0, e->evt_data,
+				     e->size);
 
 		spin_lock_irqsave(&wm_event.evt_lock, flags);
 		list_del(&e->list);